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A B is equal angle contained answer areas axiom base beginning bisected called centre circle common compared construction Definition demonstration describe direction DISCUSSION draw drawn Eighth Proposition enunciation equal sides equilateral triangle Euclid exactly exercise extremity fall fifth figure five steps follows fourth proposition give given equal given point given straight line greater included angles join learner length letters look lying meaning meet observe opposite Particular Enunciation pencil placed produced proof Prop proved equal question reading reasoning reference required to prove respect right angles shown side A B space square steps straight line A B suppose surface taken things third triangle A B C vertex Wherefore whole write written
Σελίδα 54 - If two triangles have two sides of the one equal to two sides of the...
Σελίδα 10 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Σελίδα 103 - On the same base, and on the same side of it, there cannot be two triangles having their sides which are terminated at one extremity of the base equal to one another, and likewise those which are terminated at the other extremity equal to one another.
Σελίδα 83 - If two angles of a triangle be equal to one another, the sides also which subtend, or are opposite to, the equal angles, shall be equal to one another.
Σελίδα 123 - The neglect which he had shown of the elementary truths of geometry he afterwards regarded as a mistake in his mathematical studies ; and on a future occasion he expressed to Dr. Pemberton his regret that " he had applied himself to the works of Descartes, and other algebraic writers, before he had considered the Elements of Euclid with that attention which so excellent a writer deserved."3 The study of Descartes...
Σελίδα 89 - AC. For, if AB be not equal to AC, one of them is greater than the other : let AB be the greater, and from it cut (i.
Σελίδα 98 - Upon the same base, and on the same side of it, there cannot be two triangles that have their sides which are terminated in one extremity of' the base, equal to one another, and likewise those which are terminated in the other extremity.
Σελίδα 11 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.